A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
We knows that an electron is very light particle as compared to an a-particle. Hence electron cannot scatter the a-particle at large angles, according to law of conservation of momentum. On the other hand, mass of nucleus is comparable with the mass of a-particle, hence only the nucleus of atom is responsible for scattering of a-particles.
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